General Zhaoyun,
most of these inventions are rather compilations of already existing knowledge, not innovations, although every new compilation should certainly have included some new knowledge. Other, notably mathematical achievements were made in so close a connection with the adaptation of Euopean mathematics that one can hardly speak of indigenous inventions. In the words of one leading scholar on Chinese Mathematics, Jean-Claude Martzloff, p.69:
QUOTE
Autochthonous attempts to renovate Chinese traditional astronomy proposed before and after the fall of the Ming dynasty always failed so that European mathematical and instrumental techniques supporting the reform were gradually assimilated to the detriment of Chinese traditional astronomy.
Beyond the narrow circle of technicians of astronomy, European astronomy was so much judged worth consideration that numerous authors developed the idea that the Chinese of antiquity had anticipated most of the novelties presented by the missionaries as European discoveries, for example, the rotundity of the earth and the “heavenly spherical star carrier model.”
Making skillful use of philology, these authors cleverly reinterpreted the greatest technical and literary works of Chinese antiquity. From this sprang a new science wholly dedicated to the demonstration of the Chinese origin of astronomy and more generally of all European science and technology.
Moreover, while this science of the origins of science grew deeper, the Chinese put their efforts into the difficult reconstruction of their ancient mathematical works lost or long forgotten but witnessing the greatness of past Chinese science and containing the seeds of a future scientific renaissance based on ancient Chinese knowledge. Even so, although declared Chinese in their origins, not all aspects of European mathematics and astronomy were approved unanimously...
http://www.uni-tuebingen.de/uni/ans/eastm/...4-martzloff.pdf Making skillful use of philology, these authors cleverly reinterpreted the greatest technical and literary works of Chinese antiquity. From this sprang a new science wholly dedicated to the demonstration of the Chinese origin of astronomy and more generally of all European science and technology. Sounds as if little has changed from then to Needham's times!
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2. Geographical mapping
During the early Qing period, the greatest achievement in map-drawing was one titled "the map of China 皇舆全览图", which was completed in 1718 after 10 years work. To draw this map, the world's most advanced theodolitic drawing method and ladder-shaped projection was adopted. The Map of China was the first national map drawn after carrying out on-the-spot survey in China.
Has this map survived?